[Softwires] Keeping support of CE IPv4 prefixes in the v4/v6 address mapping?

Rémi Després <despres.remi@laposte.net> Thu, 03 November 2011 09:04 UTC

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From: Rémi Després <despres.remi@laposte.net>
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Date: Thu, 03 Nov 2011 10:04:32 +0100
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To: Jacni Qin <jacni@jacni.com>
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Cc: Ole Troan <ot@cisco.com>, Softwires WG <softwires@ietf.org>
Subject: [Softwires] Keeping support of CE IPv4 prefixes in the v4/v6 address mapping?
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Le 3 nov. 2011 à 09:50, Jacni Qin a écrit :
>>> if the MAP just covers "shared address with one single sharing ratio for one domain",
>>> the design will be greatly simplified?
>> Requiring ISPs to maintain IPv4 routing in their networks, just to serve the few users that need to keep IPv4 prefixes, seems to me a step backward.
>> 
>> Besides, I have serious doubts about "greatly simplified".
> I mean for the design of the address/port mapping algorithm, not the transport mechanism.

Yes, but I don't see the great simplification of the algorithm.
Keeping it general enough to support IPv4 prefixes is AFAIK easy. It doesn't prevent deployments where, IPv4 prefixes being not supported, fields can be at places that may be found more convenient.

Maybe you can be more specific on your concern.

Cheers,
RD